What Are Glaciers?  Glaciers are massive blocks of ice that have been gathered over time through fallen snow being compressed into hard ice. They move very slowly due to their large size and this movement is caused by the force known as gravity! Gravity is the force by which a body (like our Earth) pulls objects towards its center.  Photograph by James L. Amos/National Geographic Creative Where Are They Found? Glaciers are mostly found in the polar regions, which makes... [read more]